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Share-based payment arrangements - Transaction based incentive plan 2019 (Cash-settled) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2019
shares
Jan. 31, 2019
shares
Jan. 08, 2019
shares
Jun. 30, 2019
$ / shares
Dec. 31, 2019
shares
tranche
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of vesting tranches | tranche         4
Long Term Incentive Plan 2019 [Member] | Phantom Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Equity instruments granted (in shares) | shares 800,000 1,200,000 1,200,000   800,000
Long Term Incentive Plan 2019 [Member] | Second anniversary | Phantom Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Annual vesting percentage       12.00% 12.00%
Target share price (in USD per share)       $ 12 $ 12
Long Term Incentive Plan 2019 [Member] | Third anniversary | Phantom Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Annual vesting percentage       19.00% 19.00%
Target share price (in USD per share)       $ 14 $ 14
Long Term Incentive Plan 2019 [Member] | Fourth anniversary | Phantom Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Annual vesting percentage       25.00% 25.00%
Target share price (in USD per share)       $ 16 $ 16
Long Term Incentive Plan 2019 [Member] | Tranche Four | Phantom Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Annual vesting percentage       44.00% 44.00%
Target share price (in USD per share)       $ 18 $ 18